I would like to propose an experimental rule for the 1991 season.
I propose the ability of using a linebacker as an defensive end ("edge rusher") on 3rd/4th down situations. Now rule, 6-7 clearly state that, "Defensive line players may only include players whose primary position is a defensive lineman who weighs at least 276 lbs." and "LB may only include players whose primary position is LB or S." My proposal is on all 3-4 and 4-3 defenses, users have the ability ONLY on 3rd and 4th down situations to use an override to position ONE linebacker to a defensive end. Hopefully this will prevent a season where a LB got 34 sacks* in an entire season but also at least provide a decent amount of pressure without having to call on a blitz in order to use a LB to go after the QB and leave one area open for a wide open receiver.
I will detail further in the rules debate if this is seconded and third.
*
https://paydirt.myfootballnow.com/player/7455